With over 2.5 billion monthly active users, YouTube has become a dominant platform for content creation, personal branding, marketing, and entertainment. Growing a YouTube channel requires more than just uploading videos; it demands a strategic approach involving content planning, audience engagement, search engine optimization (SEO), branding, analytics, and consistency. This review provides a comprehensive overview of proven techniques, tools, and strategies to grow YouTube channels organically and sustainably. It also explores algorithm behavior, monetization opportunities, and the impact of emerging trends such as YouTube Shorts and AI-driven content optimization.